In nearly all things, water, food, a way to keep warm and dry, a way to deal with waste hygienically, keep clean and a way to defend yourself are requirements. Communications and lighting are not as necessary but are very nice to have.
Your easiest and cheapest way to do all of this for a two week period is as follows:
Water: 1 gallon of water per person is your minimum. Two is a much better goal. Half of this can be bottled water but tap water in gallon jugs can make up the other half. Do not use old milk jugs. Vinegar jugs are my personal choice but any other thick plastic just that can be cleaned out will work as well.
Food: Go with canned or packaged here. You need about 1,000 calories per day per person at minimum. Choose things you would normally eat. You are going for "open can, eat".
Keeping warm and dry: Propane heater. If you can get a small camp stove for warm food and water that helps as well. Tarps will cover holes in roofs or broken windows.
Waste: Sealing waste can. Kitty litter. Just the cheap clay kind without scent. Baking soda. Plastic bags. You can line your bowl with the bag, dump in some litter and baking soda and go. Remove and tie bag closed and place in sealing waste container.
Keeping yourself clean: Dry shampoo, baking soda, baby wipes. You will not smell like a rose but you will not develop skin infections.
Self defense: Gun. Ammo. Generally a shotgun with buckshot will work. Pump action 5+1 is my recommendation but dealers choice. A hand gun is also recommended but that may not be possible in your area.
Communications: Battery operated two way radio and a battery operated multiband radio receiver. Knowing what is going on is nice. You will need either a box of batteries or a way to charge your items that does not depend on the electricity being on.
Lighting: Flashlights, oil lamps, candles. A battery operated lantern is about the most safe way to have light. Followed by a hurricane lamp, other types of oil lamps and candles. Candles should always be the last resort as they will be the most likely to cause a fire. Never leave them unattended. Always place them on a large baking tray so when they fall over they do not set things on fire.
Basic tools: ax, knife (not a rambo type knife, just a good solid, sharp belt knife) whetstone, fire extinguisher (several), rope and cord, hammer and nails, screwdriver, crowbar, good first aid kit, good burn treatment kit.
This should get you through two weeks without dying and it works no matter where you are.
This does not cover your personal situation because it is not meant to do so. You should have enough of your personal medications on hand to last for at least a month because you are an adult and should have enough foresight to do that. You should have basic first aid knowledge and know how to do basic repairs for the same reason.
We have a couple older camping lanterns that we found replacement LED light bulbs for. They do not eat batteries like the old bulbs did.
Thanks for mentioning waste/toilets. A good friend of mine and I have an ongoing conversation about ‘improvements’ we’ve made to your basic bucket toilet. ;)
Both of us were big campers back in the day, so it’s been a life-long learning curve. ;) And I can attest that digging Army latrines in the field is every so much fun, LOL!
https://www.primalsurvivor.net/bucket-toilet/
When I get my final design down to something along the lines of a Litter Genie that you use for cats, I’m gonna be rich, Rich, RICH! ;)